S04.812A (Injury of olfactory [1st ] nerve, left side, initial encounter) compared with S04.819A (Injury of olfactory [1st ] nerve, unspecified side, initial encounter), from the official CMS tabular data. S04.812A and S04.819A code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. S04.812A and S04.819A name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| S04.812AInjury of olfactory [1st ] nerve, left side, initial encounter | S04.819AInjury of olfactory [1st ] nerve, unspecified side, initial encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Injury of olfactory [1st ] nerve, left side, initial encounter is a billable ICD-10-CM diagnosis code (S04.812A). | Injury of olfactory [1st ] nerve, unspecified side, initial encounter is a billable ICD-10-CM diagnosis code (S04.819A). |
| 7th character | The appropriate 7th character is to be added to each code from category S04 | The appropriate 7th character is to be added to each code from category S04 |
| Includes | injuries of ear injuries of eye injuries of face [any part] injuries of gum | injuries of ear injuries of eye injuries of face [any part] injuries of gum |
| Code first | any associated intracranial injury (S06.-) | any associated intracranial injury (S06.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources